1. Department of Radiology, Balgrist University Hospital, Forchstrasse 340, 8008 Zurich, Switzerland.
2. University of Zurich, Faculty of Medicine, Zurich, Switzerland.
3. Department of Radiology, Clinic Hirslanden Zurich, Zurich, Switzerland.
4. Department of Radiology, Kantonsspital Winterthur, Winterthur, Switzerland.
5. Department of Obstetrics & Gynecology, Kantonsspital Winterthur, Winterthur, Switzerland.